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Specifications
| Appearance: | White to light-yellow crystalline powder |
| Assay (On Dried Basis): | 99.0%~101.0% |
| Identification: | HPLC/UV |
| Solubility: | Very soluble in acetic acid, sparingly soluble in water and ethanol (99.5) |
| Melting point: | 159℃~163℃ |
| Acidity (pH) (1% solution in water): | About 3.8 |
| Related Substances (by HPLC): | Total impurities 1.0% max Maximum single impurity: 0.05% max |
| Residual solvents (By GC): | Acetonitrile: 0.04% max |
| Optical isomer: | 0.5% max |
| Loss on drying (At 105℃ till constant weight): | 1.0% max |
| Residue on Ignition: | 0.1% max |
| Heavy Metals: | 10ppm max |
Applications
1. Antihistamine for Allergic Conditions
Bepotastine besilate is primarily used as a non-sedating H1-receptor antagonist, effective in treating:
Allergic rhinitis (nasal allergies)
Urticaria (hives)
Atopic dermatitis
Allergic conjunctivitis (as an eye drop formulation)
2. Ophthalmic Formulations
Marketed as eye drops (e.g., Bepreve®) for itchy eyes due to seasonal allergies.
Reduces ocular inflammation, itching, and redness by blocking histamine release at the site of action.
3. Dermatological Uses
Used orally in the management of chronic idiopathic urticaria and eczema, offering symptomatic relief without heavy sedation.
4. Nasal Sprays and Oral Tablets
Bepotastine besilate can be formulated as oral tablets or nasal preparations, offering multiple routes of administration for allergy management.
Benefits
✅ Selective H1 Antagonist
Bepotastine selectively inhibits the H1 histamine receptor without significantly affecting other histamine receptor subtypes, reducing the likelihood of side effects.
✅ Non-Sedating
Unlike first-generation antihistamines, it does not readily cross the blood-brain barrier, minimizing central nervous system effects like drowsiness or cognitive impairment.
✅ Dual Action
In addition to histamine receptor antagonism, it stabilizes mast cells, reducing further histamine release and inflammation.
✅ Rapid Onset of Action
Provides fast relief from allergic symptoms, often within 30 minutes, especially when used in ocular applications.
✅ Long Duration of Effect
Offers sustained antihistaminic effect with once or twice-daily dosing, improving compliance in patients with chronic allergies.
✅ Good Safety Profile
Well tolerated with a low incidence of adverse effects; minimal interactions with other medications.
Conclusion
Bepotastine besilate (CAS 190786-44-8) is a modern, selective, and well-tolerated antihistamine used primarily in the treatment of ocular and systemic allergic disorders. Its dual-action mechanism, non-sedative nature, and multiple administration routes (eye drops, oral tablets) make it a valuable agent in the management of allergic symptoms with improved patient comfort and quality of life.
